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Hi and thanks in advance.

I am trying to figure out what’s the key of the following progression. (all major chords)

D – F – C – G

What I’ve tried until now has been laying out the single notes of the triads which makes ( D F# A, F A C, C E G, G B D).

I am having trouble because of the F chord, you could think this as G major (being G (I), C (IV), D (V)) but the F chord just does not fit. Also as we have a major D chord (D F# A), and a C chord (C E G) wich would makes two consecutive semitone jumps (from E to F to F#). Would this make it a non diatonic key?

Thanks!!

Lee Answered question October 9, 2020